Husqvarna YTH150 - SCHEMATIC; IGNITION SWITCH; PTO SWITCH

29
TRACTOR - MODEL NO. YTH150 (HCLTH150E), PRODUCT NO. 954 14 00-07
SCHEMATIC
BATTERY
FUSE
RED
RED
BLACK
IGNITION
UNIT
SPARK
PLUGS GAP
(2 PLUGS ON
TWIN CYL. ENGINES)
NON-REMOVABLE
CONNECTIONS
REMOVABLE
CONNECTIONS
BLACK
BROWN
M
SOLENOID
NOTE
YOUR TRACTOR IS
EQUIPPED WITH A SPECIAL
ALTERNATOR SYSTEM.
THE LIGHTS ARE NOT 
CONNECTED TO THE
BATTERY, BUT HAVE THEIR
OWN ELECTRICAL SOURCE.
BECAUSE OF THIS, THE
BRIGHTNESS OF THE LIGHTS
WILL CHANGE WITH ENGINE
SPEED. AT IDLE THE LIGHTS
WILL DIM. AS THE ENGINE IS
SPEEDED UP, THE LIGHTS
WILL BECOME THEIR BRIGHTEST.
WIRING INSULATED CLIPS
NOTE: IF WIRING INSULATED 
CLIPS WERE REMOVED FOR 
SERVICING OF UNIT, THEY 
SHOULD BE REPLACED TO 
PROPERLY SECURE YOUR WIRING.
A
AMMETER
RED
IGNITION SWITCH
CIRCUITPOSITION
OFF
B + LRUN/LIGHT
B + L + SSTART
G + M + L
S
B
G
ML
B + LRUN
“MAKE”
A + Y
NONE
NONE
NONE
Y
A
(OPTIONAL)
HEADLIGHTS
BLACK
RED
ELECTRIC CLUTCH
CLUTCH / BRAKE
(PEDAL UP)
PTO (DISENGAGED)
CG
F
B
E
A
D
H
RED
WHITE
BLACK
HOUR
METER
(OPTIONAL)
BLUE
STARTER
PTO SWITCH
CIRCUITPOSITION
OFF
C + F, B + E, A + D ON
C + G, B + H
B
A
G
H
D
FC
E
FUEL SHUT-OFF SOLENOID
FUEL
LINE
IGNITION
SWITCH
G
B
S
M
L
AY
OPERATOR 
PRESENCE
RELAY #1
85 86
30
87
87A
SEAT SWITCH
(NOT OCCUPIED)
87
87A
8586
30
RELAY
LIGHTING SYSTEM 
OUTPUT
5 AMP AC @ 3600 RPM
ALTERNATOR
14 VOLTS AC MIN. @ 3600 RPM (LIGHTS OFF)
DIODE
28 VOLTS AC MIN. @ 3600 RPM 
(CHARGING SYSTEM DISCONNECTED)
CHARGING SYSTEM OUTPUT
3 AMP DC @ 3600 RPM